Bobbin for electrical feelers



Dec. 30, 1930. E HOLMES 1,786,654

BOBBIN FOR ELECTRICAL FEELERS Filed July 22. 1929 fy l EN 70R EL AER/05E 5. H04 M55 A UR/v5 Y5 Patented Dec. 30, 1930 UNITED STATES PATENT o Fi'ca ELBRIDGE HOLMES, OF WORCESTER, MASSACHUSETTS, ASSIGNOR TO CROMPTON & KNOWLES LOOM WORKS,OF WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS :31am FORYELECTIRICAL FEELERS Application filed v July 22,1929. Serial No. 380,147.

Thisinvention relates to improvements in bobbins for electrical weft detector for looms,

and it is the general object of the invention to provide a bobbin with an improved and 5 readily applicable type of metallic surface.

Bobbins to cooperate with electrical feelers have heretofore been made with metallic ferrules to engage the oppositely charged electrodes of the feeler; These ferrules have smooth surfaces over which the coils of yarn may slip, thereby interfering with the proper tensioning of the weft. It isa further object of my present invention to provide a metallic surface which is applied to the bobbin in spiral form so that the spaces between successive convolutions may hold the weft against endwise movement along the bobbin.

It is a further object of my present invention to employ a flexible tape made up largely of tinsel or metal foil wound on a portion of the bobbin and being continuous throughout its length so that the electric contactingele ments to be electrically connected, thereby may be spaced either vertically or 1 horizontally.

' It is a more specific object of my present invention to employ a tape having in its construction cotton yarns which will adhere to glue or other adhesive by means of which the tape is secured to the bobbin.

With these and other objects in view which will appear as the description proceeds my invention resides in the combination and arrangement of parts hereinafter described and set forth in the claims.

In the accompanying drawings, wherein a convenient embodiment of my present in-- vention is set forth,

Fig. 1 is a plan view of a bobbin made Referring particularly to Fig. 1, I have according to my present invention, electri shown a bobbin spindle 10 which may be mounted'in any approved manner in shuttle S and have mounted thereon a paper tube, cop orbobbin 11. The latter is formed with circumferential grooves 12 which assist in holding weft to the bobbin during the weaving operation.

The front wall of'the shuttle is provided with slot 13 through which project the positive andnegative electrode elements 14 and 15, respectively, of an electrical feeler. It is unnecessary to go into further detail in re gard to the feeler in the present application inasmuch as my invention relates to the bobbin and will cooperate with any form of electrical weft detector having two oppo-' sitely charged members to extend into the are formed preferably of some textile fibre,

such as cotton. Located between strands 21 and 22 are several warps 23 formed of tinsel or metallic foil. A. filling thread 24 which is preferably though not necessarily cotton is interwoven with the cotton selvages and also the metallic warps 23. The manner of interlacing is set forth on enlarged scale in 3. It will be noted that the weft 2 has its successive picks spaced and at rather sharp angles with respect to the warps, this construction permittinga large portion of the surface of the metallic warps to be exposed.

In making the cop or bobbin the butt end thereofis coated with a suitable adhesive such as glue and a length of tape is then wound on the butt. The tape is preferably wound spirally to leave spaces 25 between successive convolutions. As shown on Fig. 1 the tape will stand up slightly from the body of the bobbin to prevent edges which Will engage the coils of yarn and prevent sliding of the same on the bobbin. Because of the fact that the tape is made up of a series of metallic warps it is possible to wind the bobbin without'the intervening spaces 25, the warps offering a sufliciently grooved surface to hold the mass of weft from longitudinal sliding on the bobbin.

While I have described the metallic surface as being provided by a tape, yet I do not wish to be limited to this particular form of surface, as my invention contemplates the use of any flexible yarn having a metallic or current conducting surface.

lVhen the bobbin is full the tape 20 will be completely covered by the yarn and as the shuttle is moved forward with the lay the yarn engages with electrodes Qt and 25 without connecting the same. As the yarn becomes depleted, however, the tape 20 will be uncovered, whereupon electrical contact is established between plates 14 and 15. Under these conditions any of the approved electire-magnetic devices which are known in the art can be employed to stop the loom or effect weft replenishment.

From the foregoing it will be seen that I have provided a bobbin with a simple form of surface to cooperate with the electrodes of electrical weft detector. It will further be seen that the surface is provided by a tape the major portion of which is made of me tallic yarns, but which has in its construction sufficient textile fibre to effect proper adhesion to the bobbin. It will furthermore be seen that the tape is formed of a plurality of metallic warps which when wound upon the bobbin define grooves which are substantially if not truly circumferential, thereby presenting a surface which will prevent the weft from sliding endwise on the bobbin. Also, the weft thread is so disposed as to present a maximum of metallic warp to engage the feeler elements.

Having thus described my invention it Will be apparent that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention and I do not wish to be limited to the details herein disclosed but what I claim is:

1. A weft bobbin to cooperate with a pair of oppositely charged electrodes of an electrical weft detector,said bobbinhaving wound thereon a metallic tape formed of metallic yarns interwoven with yarns of textile fibre, and an adhesive to attach the yarns of textile fibre to the bobbin.

2. A weft bobbin to cooperate with a pair of oppositely charged electrodes of an electrical weft detector, a tape wound spirally on a portion of the surface of the bobbin and positioned to engage the electrodes and having metallic warp yarns running longitudinally of tape, said yarns assisting in preventing endwise movement of weft thread on the bobbin.

3. A weft bobbin to cooperate with a pair of oppositely charged electrodes of an electrical weft detector, a tape wound on and held to a portion of the surface of the bobbin by an adhesive, said tape having selvage warp threads of a textile fibre between which are located metallic warp threads, the selvage threads cooperating with the adhesive to hold the tape to the bobbin.

4. A weft bobbin to cooperate with a pair of oppositely charged electrodes of an electrical weft detector, a tape wound on and held to a portionof the surface of the bobbin by an adhesive; said tape having selvage warp threads of a textile libre'between whiclrare located metallic warp threads, the selvage threadscooperating with the adhesive to hold the tape to the bobbin, said tape including in its construction a weft thread the successive picks of which areewidely separated.

5. A weft bobbin to cooperate with a pair 7 of oppositely charged electrodes of an elec trical'weft detector, a tape wound on and held to a portion. of the surface of the bobbin by an adhesive, said tape having selvage warp threads of a textile fibre between which are located metallic warp. threads, the selvage threads cooperating with the adhesive to hold the tape to the bobbin, said tape including in its construction a weft thread of texti e fibre the successive picksof which are widely separated and obliquely disposed with respect to warp threads.

(3. A weft bobbin to cooperate with a pair of oppositely charged electrodes of an electrical weft detector, said bobbin having wound thereon and adhesively held thereto a flexible member including in its construction a plurality of yarns having electric currentcarrying surfaces disposed for operative engagement with the charged electrodes.

7. Aweft bobbin to cooperate with a pair of oppositelycharged electrodes of an electrical weft detector, said bobbin having wound thereon and adhesively held thereto a flexible member havingan electric current carrying surface, said flexible member also including in its construction a yarn of textile fibre to absorb an adhesive by which the member is secured to thebobbin.

In testimony whereof I have hereunto affixed my signature.

ELBRIDGE R HOLMES. 

